DNS Issues - No DNS Responses

I continually have DNS issues with my Comcast service. It is not a WiFI issue becasuase:

1) We never lose the Wifi Connection

2) Windows and Browsers report DNS errors when this "outage" happens

3) My work VPN connection does not drop on my work laptop and I am still a able to to browse.

This happens multiple times a day, and allways the same issue. The DNS resolution is down for 2-3 muinutes at a time. 

How can I trouble shoot this on my end?

Thanks,

Rick